正解の外側 ～すべての正解が視える俺が、答えのない少女と世界を変えるまで～

The Underground World Abyss, the lowest level. In a place called the "Disposal Layer," a boy was called by a number.

517——that is the name of the sixteen-year-old boy Kai. Every day, he processes hazardous waste with his bare hands and eats gray paste before sleeping. Kai has a secret he cannot tell anyone. When he decides on a goal, the "correct" path to reach it appears to him as a golden line.

One day, Kai meets a silver-haired girl with no memories. She alone did not appear in Kai's path.

▶ 今すぐ遊ぶ（無料・インストール不要）

What You Can Play

• A sound novel with all 15 episodes. Play time is approximately 3-4 hours
• The protagonist Kai and heroine Leen are fully voiced
• Backgrounds are 360° panoramas rendered in 3D. In exploration sections, you can move the viewpoint yourself and search for "fragments" hidden in the world
• Choice points at key moments in the story. Some include decisions with time limits
• Mini-games woven into the story, such as "path trace" where you memorize and trace the glowing path (all can be skipped)
• A mini-map of the five underground levels that becomes clearer as you progress
• 3 types of endings in the final episode
• Supports auto/skip/6-slot save/chapter selection. Compatible with both PC and smartphone

▶ シリーズ公式サイト